Twin 20mm Gun Motor Carriage T10E1.
The T10E1 was similar to the other antiaircraft half-tracks fitted with a Maxson turret, with the difference being the 20mm guns found in place of the caliber .50 machine guns. (Picture from Weapon Mounts for Secondary Armament.)
The impressive size of the Oerlikon 20mm guns is apparent from above. The 60-round drum magazines are fitted to the guns. (Picture from Weapon Mounts for Secondary Armament.)
The T17E1 mount was modified from the M45 mount also found on the multiple gun motor carriages M16 and M17. Stronger trunnions were installed along with counterweighted trunnion segments designed to endure the heavier and more violent 20mm guns. The guns were fired via electrical solenoids or by a foot pedal. (Picture from Weapon Mounts for Secondary Armament.)
The guns were charged with manual hydraulic pumps. The charging lever for the right-side gun is seen here in the charging position. (Picture from Weapon Mounts for Secondary Armament.)
The right gun's charging lever is shown in the charged position, with the pivot point for the brake release lever visible. (Picture from Weapon Mounts for Secondary Armament.)
